US1523926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter
Assignee: Individual
•
Filing: 1923-03-26
•
Granted: 1925-01-20
•
Expires: 1943-03-26
Abstract
No abstract record available.
Inventors
- 👤 Ypma Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:39
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18; B64U; B64U10/00; B64U10/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-01-20 | 1928-07-21 | 1929-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-01-20 | 1932-07-21 | 1933-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-01-20 | 1936-07-21 | 1937-01-20 | $7700.00 | Window Closed / Lapsed |